java.lang.NullPointerException: Exception in server tick loop
        at net.minecraftforge.common.BiomeDictionary.containsType(BiomeDictionary.java:440)
        at net.minecraftforge.common.BiomeDictionary.isBiomeOfType(BiomeDictionary.java:261)
        at ic2.core.Ic2WorldDecorator.genRubberTree(Ic2WorldDecorator.java:276)
        at ic2.core.Ic2WorldDecorator.generate(Ic2WorldDecorator.java:235)
        at net.minecraftforge.fml.common.registry.GameRegistry.generateWorld(GameRegistry.java:120)
        at net.minecraft.world.chunk.Chunk.func_186034_a(Chunk.java:1001)
        at net.minecraft.world.chunk.Chunk.func_186030_a(Chunk.java:983)
        at net.minecraft.world.gen.ChunkProviderServer.func_186025_d(ChunkProviderServer.java:154)
        at com.khorn.terraincontrol.forge.generator.Pregenerator.PreGenerateChunk(Pregenerator.java:442)
        at com.khorn.terraincontrol.forge.generator.Pregenerator.Pregenerate(Pregenerator.java:330)
        at com.khorn.terraincontrol.forge.generator.Pregenerator.ProcessTick(Pregenerator.java:177)
        at com.khorn.terraincontrol.forge.events.ServerEventListener.onServerTick(ServerEventListener.java:18)
        at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_679_ServerEventListener_onServerTick_ServerTickEvent.invoke(.dynamic)
        at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90)
        at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:185)
        at net.minecraftforge.fml.common.FMLCommonHandler.onPostServerTick(FMLCommonHandler.java:261)
        at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:657)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:471)
        at java.lang.Thread.run(Thread.java:745)